/*
 * Ant Group
 * Copyright (c) 2004-2021 All Rights Reserved.
 */
package com.mashibing.tank;

import java.awt.*;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.util.ArrayList;
import java.util.List;

/**
 * 继承frame类
 * @author zhouzheng
 * @version TankFrame.java, v 0.1 2021年08月20日 10:35 上午 zhouzheng
 */
public class TankFrame extends Frame { 
    Tank   myTank  =  new Tank(200,400,Dir.DOWN,Group.GOOD,this);
    List<Bullet> bullets = new ArrayList<>();
    List<Tank> tanks = new ArrayList<>();
    List<Explode> explodes =  new ArrayList<>();

//    static final int GAME_WIDTH = 800, GAME_HEIGHT = 600;
    static final int GAME_WIDTH = 1600, GAME_HEIGHT = 1200;
    public TankFrame(){
        setSize(GAME_WIDTH,GAME_HEIGHT);
        setResizable(false);
        setTitle("Tank War");
        setVisible(true);
        this.addKeyListener(new MyKeyListener());
        addWindowListener(new WindowAdapter() {
            @Override
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });
    }

    Image offScreenImage = null;

    @Override
    public void update(Graphics g) {
        if (offScreenImage == null) {
            offScreenImage = this.createImage(GAME_WIDTH,GAME_HEIGHT);
        }
        Graphics gOffScreen = offScreenImage.getGraphics();
        Color c = gOffScreen.getColor();
        gOffScreen.setColor(Color.BLACK);
        gOffScreen.fillRect(0,0,GAME_WIDTH,GAME_HEIGHT);
        gOffScreen.setColor(c);
        paint(gOffScreen);
        g.drawImage(offScreenImage,0,0,null);
    }

    @Override
    public void paint(Graphics g) {
        Color c = g.getColor();
        g.setColor(Color.WHITE);
        g.drawString("子弹的数量：" + bullets.size(), 10, 60);
        g.drawString("敌人的数量：" + tanks.size(), 10, 80);
        g.drawString("爆炸的数量：" + explodes.size(), 10, 100);

        g.setColor(c);

        myTank.paint(g);
        //存在内存泄漏的问题，需要改进
        for (int i = 0; i < bullets.size(); i++) {
            bullets.get(i).paint(g);
        }

        for (int i = 0; i < tanks.size(); i++) {
            tanks.get(i).paint(g);
        }

        for (int i = 0; i < explodes.size(); i++) {
            explodes.get(i).paint(g);
        }

        //坦克与子弹碰撞
        for (int i = 0; i < bullets.size(); i++) {
            for (int j = 0; j < tanks.size(); j++) {
                bullets.get(i).collideWith(tanks.get(j));
            }
        }


    }

    class MyKeyListener extends KeyAdapter{
        boolean bL = false;
        boolean bR = false;
        boolean bU = false;
        boolean bD = false;
        @Override
        public void keyPressed(KeyEvent e) {
            int key = e.getKeyCode();
            switch (key) {
                case KeyEvent.VK_LEFT:
                    bL = true;
                    break;
                case KeyEvent.VK_UP:
                    bU = true;
                    break;
                case KeyEvent.VK_RIGHT:
                    bR = true;
                    break;
                case KeyEvent.VK_DOWN:
                    bD = true;
                    break;
                default:
                    break;
            }
            setMainTankDir();

        }



        @Override
        public void keyReleased(KeyEvent e) {
            int key = e.getKeyCode();
            switch (key) {
                case KeyEvent.VK_LEFT:
                    bL = false;
                    break;
                case KeyEvent.VK_UP:
                    bU = false;
                    break;
                case KeyEvent.VK_RIGHT:
                    bR = false;
                    break;
                case KeyEvent.VK_DOWN:
                    bD = false;
                    break;
                case KeyEvent.VK_SPACE:
                    myTank.fire();
                    break;
                default:
                    break;
            }
            setMainTankDir();
        }

        private void setMainTankDir() {

            if (!bL && !bU && !bR && !bD) myTank.setMoving(false);
            else {
                myTank.setMoving(true);
            if (bL) myTank.setDir(Dir.LEFT);
            if (bU) myTank.setDir(Dir.UP);
            if (bR) myTank.setDir(Dir.RIGHT);
            if (bD) myTank.setDir(Dir.DOWN);
            }
         }

    }
}